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Any info about Line6 fileformat l6t?

Hi,
I found a thread from 2006 in here, talking about the file format *.l6t of the Line 6 Edit Software. (http://ubuntustudio.org/uploads/l6t-file-format.pdf) Please can anyone inside help me with some infos about this scary format? I try to update the old software "Tone Control" with some additional infos, but can't find anything about the internal structure of this format.
Greez,
Chris